Biochemical and inflammatory markers: Apart from the common laboratory screening tests (whole blood count, AST, ALT, γGT, ALP, Urea, Creatinine, glucose, total cholesterol, triglycerides, LDL, HDL, Na+, K+, Ca2+, CRP), we will determine additional proinflammatory and prothrombotic biomarkers in patients' plasma. More specifically, using enzyme-linked immunosorbent assay (ELISA) we will quantify interleukin-6 and other adipokines both in patients plasma and adipose tissue cultures supernatants. Using high precision liquid chromatography (HPLC) we will quantify biopterin plasma and vascular levels (tetrahydrobiopterin, dihydrobiopterin and total biopterins).Studies have shown that the abovementioned markers may have a prognostic value in high cardiovascular risk patients.